Device and system for detecting dynamic strain

Registre Brevet USPTO
Numéro d'application 16679050
Numéro de brevet 11002620
Statut Délivré - en vigueur
Date de dépôt 2019-11-08
Date de la première publication 2020-08-06
Date de publication 2020-08-06
Date d'octroi 2021-05-11
Propriétaire Hifi Engineering Inc. (Canada)
  • Hull, John
  • Jalilian, Seyed Ehsan


A device and system for detecting dynamic strain. The device comprises a longitudinally extending carrier and an optical fiber embedded along an outer surface of a length of the carrier. The optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths. The system comprises the device and an interrogator comprising a laser source and a photodetector. The interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs. The interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.

Classes IPC  ?

  • G01B 9/02 - Interferometers
  • G01L 1/24 - Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis
  • G01D 5/353 - Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using optical means, i.e. using infra-red, visible or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre